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How to fix the sound on a mac computer 
Restart the computer. 
Sometimes a simple reboot will fix the audio issues you are experiencing. This should always be the first thing you try when something goes wrong.

Possible answers: - Navigate to system preferences] sound at the front of the mac. Select " system preferences] audio repository " from the menu on the left-hand side of the window.. - It will require that you restart the computer and reconnect the usb port in the back of the computer. Sometimes steps can be taken to address the bad sound.. - Try looking for something with an sound button or a mouse, and seeing if you can use the button to bring up your computer's internal music menu. If you can't find the source sound, try pressing and holding the volume down key and then viewing your mouse.. - Plug headphones in and then remove them. If your volume controls are grayed out or you see a red light from your headphone jack, insert and remove an apple headphone plug a few times..
Answer:
Plug headphones in and then remove them. If your volume controls are grayed out or you see a red light from your headphone jack, insert and remove an apple headphone plug a few times.